WO2019060505A1 - Sélection d'une porteuse composante pour la syntonisation à distance de communication entrée multiple sortie multiple (mimo) pour effectuer une mesure de signal de référence de positionnement inter-fréquences - Google Patents

Sélection d'une porteuse composante pour la syntonisation à distance de communication entrée multiple sortie multiple (mimo) pour effectuer une mesure de signal de référence de positionnement inter-fréquences Download PDF

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Publication number
WO2019060505A1
WO2019060505A1 PCT/US2018/051883 US2018051883W WO2019060505A1 WO 2019060505 A1 WO2019060505 A1 WO 2019060505A1 US 2018051883 W US2018051883 W US 2018051883W WO 2019060505 A1 WO2019060505 A1 WO 2019060505A1
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WIPO (PCT)
Prior art keywords
receive chains
ccs
inter
perform
selecting
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PCT/US2018/051883
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English (en)
Inventor
Akash Kumar
Amit Jain
Ankita ---
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Qualcomm Incorporated
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Publication of WO2019060505A1 publication Critical patent/WO2019060505A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/08—Systems for determining direction or position line
    • G01S1/20—Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G01S5/0221—Receivers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/10—Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements, e.g. omega or decca systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0891—Space-time diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Definitions

  • Embodiments relate to selecting a component carrier to be tuned away from multiple-input multiple-output (MIMO) communication to perform an inter-frequency positioning reference signal (PRS) measurement.
  • MIMO multiple-input multiple-output
  • PRS inter-frequency positioning reference signal
  • Wireless communication systems are widely deployed to provide various types of communication content such as voice, data, and so on. These systems may be multiple- access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth and transmit power). Examples of such multiple-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, and Orthogonal Frequency Division Multiple Access (OFDMA) systems.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • OFDMA Orthogonal Frequency Division Multiple Access
  • a wireless multiple-access communication system can simultaneously support communication for multiple user equipments (UEs).
  • UEs user equipments
  • Each UE communicates with one or more base stations via transmissions on the forward and reverse links.
  • the forward link refers to the communication link from the base stations to the UEs
  • the reverse link refers to the communication link from the UEs to the base stations.
  • This communication link may be established via a single-input single-output, multiple-input single-output or a multiple-input multiple-output (MIMO) system.
  • MIMO multiple-input multiple-output
  • a MIMO system (e.g., LTE-Advanced or LTE MIMO) employs multiple transmit antennas and multiple receive antennas for data transmission.
  • MIMO systems such as LTE MIMO, may use carrier aggregation that allows a number of carriers to be combined or aggregated. Each aggregated carrier is referred to as a component carrier (CC).
  • CC component carrier
  • a primary CC (PCC) is established between a UE and a primary serving cell, and one or more secondary CCs (SCCs) may be established between the UE and a secondary serving cell.
  • the SCCs may be added and removed as required, while the PCC is changed upon handover to a new primary serving cell.
  • Each CC comprises a set of transmit carriers (or chains) and a set of receive carriers (or chains).
  • the respective chains of each CC are implemented in accordance with either a spatial multiplexing scheme (e.g., different data is received or transmitted on each respective chain to improve bandwidth) or a spatial diversity scheme (e.g., the same data is redundantly received or transmitted on each respective chain to improve reliability).
  • An embodiment is directed to a method of operating a user equipment (UE), including performing multiple-input multiple-output (MIMO) communication on a plurality of Component Carriers (CCs) in accordance with a Carrier Aggregation (CA) scheme with each CC having an associated rank number that indicates a respective number of receive chains for the CC, selecting at least one of the plurality of CCs for tuning away from the MIMO communication in order to perform an inter-frequency Positioning Reference Signal (PRS) measurement based at least in part upon a per-rank throughput contribution by each of the plurality of CCs, a transmission mode of the selected at least one CC and/or a channel quality of the selected at least one CC, and tuning a set of receive chains of the selected at least one CC away from the MIMO communication to perform the inter-frequency PRS measurement.
  • MIMO multiple-input multiple-output
  • CA Carrier Aggregation
  • An embodiment is directed to a method of operating a UE, including means for performing MIMO communication on a plurality of CCs in accordance with a CA scheme with each CC having an associated rank number that indicates a respective number of receive chains for the CC, means for selecting at least one of the plurality of CCs for tuning away from the MIMO communication in order to perform an inter- frequency PRS measurement based at least in part upon a per-rank throughput contribution by each of the plurality of CCs, a transmission mode of the selected at least one CC and/or a channel quality of the selected at least one CC, and means for tuning a set of receive chains of the selected at least one CC away from the MIMO communication to perform the inter- frequency PRS measurement.
  • An embodiment is directed to a method of operating a UE, including at least one processor coupled to a transceiver and configured to perform MIMO communication on a plurality of CCs in accordance with a CA scheme with each CC having an associated rank number that indicates a respective number of receive chains for the CC, select at least one of the plurality of CCs for tuning away from the MIMO communication in order to perform an inter-frequency PRS measurement based at least in part upon a per-rank throughput contribution by each of the plurality of CCs, a transmission mode of the selected at least one CC and/or a channel quality of the selected at least one CC, and tune a set of receive chains of the selected at least one CC away from the MIMO communication to perform the inter-frequency PRS measurement.
  • An embodiment is directed to a method of operating a non-transitory computer- readable medium containing instructions stored thereon, which, when executed by a UE cause the UE to perform operations, the instructions including at least one instruction configured to cause the UE to perform MIMO communication on a plurality of CCs in accordance with a CA scheme with each CC having an associated rank number that indicates a respective number of receive chains for the CC, at least one instruction configured to cause the UE to select at least one of the plurality of CCs for tuning away from the MIMO communication in order to perform an inter- frequency PRS measurement based at least in part upon a per-rank throughput contribution by each of the plurality of CCs, a transmission mode of the selected at least one CC and/or a channel quality of the selected at least one CC, and at least one instruction configured to cause the UE to tune a set of receive chains of the selected at least one CC away from the MIMO communication to perform the inter-frequency PRS measurement.
  • FIG. 1 illustrates a high-level system architecture of a wireless communications system in accordance with an embodiment of the disclosure.
  • FIG. 2 illustrates a user equipment (UE) in accordance with an embodiment of the disclosure.
  • FIG. 3 illustrates a process of performing an inter-frequency Positioning Reference Signal (PRS) measurement.
  • PRS Positioning Reference Signal
  • FIG. 4 illustrates a process of performing an inter-frequency PRS measurement whereby less than all receive chains of a component carrier (CC) are tuned away from MEVIO communication to perform an inter-frequency PRS measurement in accordance with an embodiment of the disclosure.
  • CC component carrier
  • FIG. 5 illustrates an example implementation of the process of FIG. 4 in accordance with an embodiment of the disclosure.
  • FIG. 6 illustrates a process of performing an inter-frequency PRS measurement in accordance with an embodiment of the disclosure.
  • FIG. 7 illustrates an example implementation of a portion of FIG. 6 in accordance with an embodiment of the disclosure.
  • FIG. 8 illustrates an example implementation of a portion of FIG. 6 in accordance with another embodiment of the disclosure.
  • Embodiments of the disclosure are directed to selecting a component carrier to be tuned away from multiple-input multiple-output (MEVIO) communication to perform an inter-frequency positioning reference signal (PRS) measurement.
  • MVIO multiple-input multiple-output
  • PRS inter-frequency positioning reference signal
  • a client device may be mobile or stationary, and may communicate with a wired access network and/or a radio access network (RAN).
  • RAN radio access network
  • UE may be referred to interchangeably as an "access terminal” or “AT”, a “wireless device”, a “subscriber device”, a “subscriber terminal”, a “subscriber station”, a “user terminal” or UT, a "mobile device”, a “mobile terminal”, a “mobile station” and variations thereof.
  • AT access terminal
  • AT wireless device
  • subscriber device a subscriber terminal
  • a subscriber station a "user terminal” or UT
  • mobile device a mobile terminal
  • mobile station a “mobile station” and variations thereof.
  • UEs can communicate with a core network via the RAN, and through the core network the UEs can be connected with external networks such as the Internet.
  • UEs can be embodied by any of a number of types of devices including but not limited to cellular telephones, personal digital assistants (PDAs), pagers, laptop computers, desktop computers, printed circuit (PC) cards, compact flash devices, external or internal modems, wireless or wireline phones, and so on.
  • PDAs personal digital assistants
  • PC printed circuit
  • compact flash devices external or internal modems, wireless or wireline phones, and so on.
  • a communication link through which UEs can send signals to the RAN is called an uplink channel (e.g., a reverse traffic channel, a reverse control channel, an access channel, etc.).
  • a communication link through which the RAN can send signals to UEs is called a downlink or forward link channel (e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc.).
  • a communication link through which UEs can send signals to other UEs is called a peer-to-peer (P2P) or device-to-device (D2D) channel.
  • P2P peer-to-peer
  • D2D device-to-device
  • FIG. 1 illustrates a high-level system architecture of a wireless communications system 100 in accordance with an embodiment of the disclosure.
  • the wireless communications system 100 contains UEs 1...N.
  • UEs 1...2 are illustrated as cellular calling phones
  • UEs 1...6 are illustrated as cellular touchscreen phones or smart phones
  • UE N is illustrated as a desktop computer or personal computer.
  • UEs 1...N are configured to communicate with an access network (e.g., a RAN 120, an access point 125, etc.) over a physical communications interface or layer, shown in FIG. 1 as air interfaces 104, 106, 108 and/or a direct wired connection.
  • the air interfaces 104 and 106 can comply with a given cellular communications protocol (e.g., CDMA, EVDO, eHRPD, GSM, EDGE, W-CDMA, 4G LTE, 5G LTE, etc.), while the air interface 108 can comply with a wireless protocol (e.g., IEEE 802.11).
  • the RAN 120 may include a plurality of access points that serve UEs over air interfaces, such as the air interfaces 104 and 106.
  • the access points in the RAN 120 can be referred to as access nodes or ANs, access points or APs, base stations or BSs, Node Bs, eNode Bs, and so on. These access points can be terrestrial access points (or ground stations), or satellite access points.
  • the RAN 120 may be configured to connect to a core network 140 that can perform a variety of functions, including bridging circuit switched (CS) calls between UEs served by the RAN 120 and other UEs served by the RAN 120 or a different RAN altogether, and can also mediate an exchange of packet- switched (PS) data with external networks such as Internet 175.
  • CS circuit switched
  • UE N is shown as connecting to the Internet 175 directly (i.e., separate from the core network 140, such as over an Ethernet connection of WiFi or 802.11-based network).
  • the Internet 175 can thereby function to bridge packet- switched data communications between UEs 1...N via the core network 140.
  • the access point 125 is separate from the RAN 120.
  • the access point 125 may be connected to the Internet 175 independent of the core network 140 (e.g., via an optical communications system such as FiOS, a cable modem, etc.).
  • the air interface 108 may serve UE 5 or UE 6 over a local wireless connection, such as IEEE 802.11 in an example.
  • UE N is shown as a desktop computer with a wired connection to the Internet 175, such as a direct connection to a modem or router, which can correspond to the access point 125 itself in an example (e.g., for a WiFi router with both wired and wireless connectivity).
  • a server 170 is shown as connected to the Internet 175, the core network 140, or both.
  • the server 170 can be implemented as a plurality of structurally separate servers, or alternately may correspond to a single server.
  • the server 170 may correspond to any type of server, such as a web server (e.g., hosting a web page), an application download server, or an application server that supports particular communicative service(s), such as Voice-over-Internet Protocol (VoIP) sessions, Push- to-Talk (PTT) sessions, group communication sessions, a social networking service, etc.
  • VoIP Voice-over-Internet Protocol
  • PTT Push- to-Talk
  • UEs 1...3 are depicted as part of a D2D network or D2D group 185, with UEs 1 and 3 being connected to the RAN 120 via the air interface 104.
  • UE 2 may also gain indirect access to the RAN 120 via mediation by UEs 1 and/or 3, whereby data 'hops' to/from UE 2 and one (or more) of UEs 1 and 3, which communicate with the RAN 120 on behalf of UE 2.
  • the D2D group 185 may be supported via one or more WPAN RATs, in an example.
  • FIG. 2 illustrates a UE 200 in accordance with an embodiment of the disclosure.
  • the UE 200 includes one or more processors 205 (e.g., one or more ASICs, one or more digital signal processors (DSPs), etc.) and a memory 210 (e.g., random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash cards, or any memory common to computer platforms).
  • processors 205 e.g., one or more ASICs, one or more digital signal processors (DSPs), etc.
  • a memory 210 e.g., random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash cards, or any memory common to computer platforms.
  • RAM random access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • flash cards or any memory common to computer platforms.
  • the memory 210 may include content (e.g., media files that can be accessed via a media gallery application), as well as various applications (e.g., a media gallery application, a facial recognition module, a media capture or camera application, one or more messenger or call applications, a web browser, a navigation or mapping application, etc.) that are executable by the one or more processors 205 via an associated operating system.
  • the UE 200 also includes one or more user interface (UI) input components 215 (e.g., a keyboard and mouse, a touchscreen, a microphone, one or more buttons such as volume or power buttons, etc.) and one or more UI output components 220 (e.g., speakers, a display screen, a vibration device for vibrating the UE 200, etc.).
  • UI user interface
  • the UE 200 further includes a wired communications interface 225 and a wireless communications interface 230.
  • the wired communications interface 225 can be used to support wired local connections to peripheral devices (e.g., a universal serial bus (USB) connection, a mini USB, Firewire or lightning connection, a headphone jack, graphics ports such as serial, video graphics array (VGA), high- definition multimedia interface (HDMI), digital visual interface (DVI) or DisplayPort, audio ports, and so on) and/or to a wired access network (e.g., via an Ethernet cable or another type of cable that can function as a bridge to the wired access network such as HDMI vl.4 or higher, etc.).
  • peripheral devices e.g., a universal serial bus (USB) connection, a mini USB, Firewire or lightning connection, a headphone jack, graphics ports such as serial, video graphics array (VGA), high- definition multimedia interface (HDMI), digital visual interface (DVI) or DisplayPort, audio ports, and so on
  • the wireless communications interface 230 includes one or more wireless transceivers for communication in accordance with a local wireless communications protocol (e.g., wireless local area network (WLAN) or WiFi, WiFi Direct, one or more wireless personal area network (WPAN) radio access technologies (RATs), LTE Direct (LTE-D), Miracast, etc.).
  • the wireless communications interface 230 may also include one or more wireless transceivers for communication with a cellular RAN (e.g., via CDMA, W-CDMA, time division multiple access (TDMA), frequency division multiple access (FDMA), Orthogonal Frequency Division Multiplexing (OFDM), GSM, or other protocols that may be used in a wireless communications network or a data communications network).
  • a local wireless communications protocol e.g., wireless local area network (WLAN) or WiFi, WiFi Direct, one or more wireless personal area network (WPAN) radio access technologies (RATs), LTE Direct (LTE-D), Miracast, etc.
  • the wireless communications interface 230 may also include one or
  • the various components 205-230 of the UE 200 can communicate with each other via a bus 235.
  • the processors 205 can be coupled, for example via bus 235, to one or more transceivers of the wireless communications interface 230 and be configured to perform the functionality of blocks 400, 405, 410, and 415 of FIG. 4 and/or perform the functionality of blocks 600, 605, 610, and 615 of FIG. 6.
  • the UE 200 may correspond to any type of UE, including but not limited to a smart phone, a laptop computer, a desktop computer, a tablet computer, a wearable device (e.g., a pedometer, a smart watch, etc.) and so on.
  • a smart phone e.g., a laptop computer, a desktop computer, a tablet computer, a wearable device (e.g., a pedometer, a smart watch, etc.) and so on.
  • FIG. 2 Two particular implementation examples of the UE 200 are depicted in FIG. 2, which are illustrated as laptop 240 and touchscreen device 255 (e.g., a smart phone, a tablet computer, etc.).
  • the laptop 240 includes a display screen 245 and a UI area 250 (e.g., keyboard, touchpad, power button, etc.), and while not shown the laptop 240 may include various ports as well as wired and/or wireless transceivers (e.g., Ethernet card, WiFi card, broadband card, satellite position system (SPS) antennas such as global positioning system (GPS) antennas, etc.).
  • wired and/or wireless transceivers e.g., Ethernet card, WiFi card, broadband card, satellite position system (SPS) antennas such as global positioning system (GPS) antennas, etc.
  • the touchscreen device 255 is configured with a touchscreen display 260, peripheral buttons 265, 270, 275 and 280 (e.g., a power button, a volume or vibrate control button, an airplane mode toggle button, etc.), and at least one front-panel button 285 (e.g., a Home button, etc.), among other components, as is known in the art. While not shown explicitly as part of the touchscreen device 255, the touchscreen device 255 can include one or more external antennas and/or one or more integrated antennas that are built into the external casing of the touchscreen device 255, including but not limited to WiFi antennas, cellular antennas, SPS antennas (e.g., GPS antennas), and so on.
  • WiFi antennas e.g., cellular antennas
  • SPS antennas e.g., GPS antennas
  • a MIMO system (e.g., LTE-Advanced or LTE MIMO) employs multiple transmit antennas and multiple receive antennas for data transmission.
  • MIMO systems such as LTE MIMO, may use carrier aggregation that allows a number of carriers to be combined or aggregated. Each aggregated carrier is referred to as a component carrier (CC).
  • CC component carrier
  • a primary CC (PCC) is established between a UE and a primary serving cell, and one or more secondary CCs (SCCs) may be established between the UE and a secondary serving cell.
  • PCC primary CC
  • SCCs secondary CCs
  • the SCCs may be added and removed as required, while the PCC is changed upon handover to a new primary serving cell.
  • Each CC comprises a set of transmit carriers (or chains) and a set of receive carriers (or chains).
  • the respective chains of each CC may be implemented in accordance with either a spatial multiplexing scheme (e.g., different data is received or transmitted on each respective chain to improve bandwidth) or a spatial diversity scheme (e.g., the same data is redundantly receive or transmitted on each respective chain to improve reliability).
  • OTDOA Observed Time Difference of Arrival
  • LTE Rel LTE Rel. 9.
  • OTDOA is a multilateration methodology in which a UE measures the time of arrival (TOA) of signals received from multiple base stations (or eNodeBs). The TOAs of cell-specific reference signals from several neighboring base stations (e.g., eNodeBs) are subtracted from a TOA of a positioning reference signal (PRS) of a reference base station (e.g., eNodeB) to form OTDOAs.
  • TOA time of arrival
  • PRS positioning reference signal
  • PRSs may be periodically transmitted by base stations (e.g., during positioning occasions that occur at a certain periodicity or interval) and may be implemented as pseudo-random Quadrature Phase Shift Keying (QPSK) sequences that are mapped in diagonal patterns with shifts in frequency and time to avoid collision with cell-specific reference signals.
  • QPSK Quadrature Phase Shift Keying
  • each time (or range) difference determines a hyperbola, and the point at which these hyperbolas intersect is the estimated UE location.
  • a UE can use one or more receive chains of a respective CC (e.g., PCC or SCC) to measure the PRS without causing any measurement gaps (MGs) because the PRS can be measured without tuning these receive chain(s) away from an operational frequency for the PRS.
  • a respective CC e.g., PCC or SCC
  • the UE must tune away one or more receive chains to the frequency of the PRS, which causes a measurement gap due to these receive chain(s) not being able to monitor downlink communications on an operational frequency while tuned away for the PRS measurement.
  • the manner in which the UE selects the receive chain(s) to be tuned away from their respective CC's operational frequency in order to perform a PRS measurement is based upon throughput (TP), as discussed below with respect to FIG. 3.
  • FIG. 3 illustrates a process of performing an inter-frequency PRS measurement.
  • a given UE has established a PCC and one or more SCCs with respective cells of the RAN 120.
  • the UE performs MIMO communication on the PCC and the one or more SCCs.
  • the given UE determines to perform an inter- frequency PRS measurement.
  • the given UE determines the throughput of each active CC (e.g., the PCC and the one or more SCCs).
  • the given UE selects the CC (e.g., PCC or SCC) with the lowest throughput contribution for performing the inter-frequency PRS measurement.
  • the given UE tunes each receive chain of the selected CC away from the MIMO communication.
  • Each CC may be characterized via a rank number that indicates the number of receive chains being used or aggregated by that CC.
  • the number of transmit chains may be the same as or different than the number of receive chains.
  • RI Rank Indicator
  • each non-selected CC continues to perform MIMO communication as in block 300, while at block 330, the selected CC performs the inter-frequency PRS measurement.
  • the given UE tunes the selected CC back to the MIMO communication, and the process returns to block 300.
  • the tuning away of each receive chain of the selected CC away from the MIMO communication causes a measurement gap on the selected CC.
  • FIG. 4 illustrates a process of performing an inter-frequency PRS measurement whereby less than all receive chains of a CC are tuned away from MIMO communication to perform an inter-frequency PRS measurement in accordance with an embodiment of the disclosure.
  • a given UE performs MIMO communication on a plurality of CCs in accordance with a CA scheme with each CC having an associated rank number (e.g., 2, 4, 8, etc.) that indicates a respective number of receive chains for the CC.
  • Means for performing the functionality of block 400 can include, but are not limited to, any combination of processor(s) 205, memory 210, instructions instructing the processor(s) 205 to perform the functionality of block 400 saved in memory 210, wireless communications interface 230, and bus 235 of FIG. 2.
  • the given UE selects at least one of the plurality of CCs for tuning away from the MIMO communication in order to perform an inter-frequency PRS measurement.
  • the selection of the CC(s) at block 405 may be implemented similarly to block 310 in at least one embodiment, such that the CC with the lowest aggregate throughput contribution is selected.
  • the selection of the CC(s) at block 405 may be implemented in accordance with any other CC selection scheme, such as the CC selection schemes described below with respect to other embodiments of the disclosure (e.g., CC selection based on per-rank throughput contribution of the CCs, a transmission mode of the CCs, a channel quality of the CCs, a combination thereof, etc.).
  • Means for performing the functionality of block 405 can include, but are not limited to, any combination of processor(s) 205, memory 210, instructions instructing the processor(s) 205 to perform the functionality of block 405 saved in memory 210, and bus 235 of FIG. 2.
  • the given UE selects, from among a plurality of receive chains allocated to the selected at least one CC, a subset of receive chains that includes less than all of the plurality of receive chains to be tuned away from the MIMO communication to perform the inter- frequency PRS measurement. For example, if one of the selected CC(s) has a rank number of 4 (e.g., 4x4) indicating 4 receive chains, the selected subset of received chains may include 2 receive chains, leaving the CC with 2 remaining receive chains (e.g., 2x2).
  • a rank number of 4 e.g. 4x4
  • one or more selection criteria may be used to select particular receive chains over other receive chains to be part of the selected subset of receive chains. For example, variations in channel quality may occur between respective receive chains of the same CC due to reasons such as UE orientation, angle-of-arrival (AOA) of signals from a base station, whether a user is holding the UE in his/her hand, and so on.
  • AOA angle-of-arrival
  • a channel quality may be determined or calculated for each receive chain of a selected CC, and one or more receive chains with the lowest determined or calculated channel quality may be designated or selected to be tuned away from the MIMO communication to perform the inter-frequency PRS measurement.
  • the determined channel quality may include a transport block size used on each receive chain (e.g., the receive chain(s) with the lowest transport block size are selected to be tuned away from the MIMO communication to perform the inter- frequency PRS measurement).
  • the determined channel quality may include a signal-to-noise ratio (SNR) on each receive chain (e.g., the receive chain(s) with the lowest SNR are selected to be tuned away from the MIMO communication to perform the inter-frequency PRS measurement).
  • SNR signal-to-noise ratio
  • a combination of transport block size and SNR and/or other channel quality metric(s) may be evaluated to select the subset of receive chains.
  • the one or more selection criteria for making receive chain selections may include chain- specific sensitivity (or performance) of the plurality of receive chains for a target PRS frequency (i.e., a frequency on which the PRS is transmitted).
  • the plurality of receive chains may be ranked with respect to the target PRS frequency based on sensitivity or performance of the respective receive chains for the target PRS frequency, with top- ranked receive chain(s) (e.g., the receive chain(s) with the highest chain- specific sensitivity) being selected at block 410 to be part of the subset of receive chains.
  • the one or more selection criteria includes chain- specific historical PRS measurement performance.
  • Means for performing the functionality of block 410 can include, but are not limited to, any combination of processor(s) 205, memory 210, instructions instructing the processor(s) 205 to perform the functionality of block 410 saved in memory 210, and bus 235 of FIG. 2.
  • the given UE tunes the selected subset of receive chains of the selected at least one CC away from the MIMO communication to perform the inter- frequency PRS measurement. While not illustrated expressly in FIG. 4, during block 415, the given UE may maintain any non-selected receive chains of the selected at least one CC that are not made part of the selected subset of receive chains tuned to the MIMO communication.
  • a measurement gap can be avoided during the tuning of block 415 by virtue of the non- selected receive chains remaining tuned to the MIMO communication during the inter-frequency PRS measurement (e.g., in contrast to FIG. 3 where all receive chains of a selected CC are tuned away for the inter-frequency PRS measurement).
  • Means for performing the functionality of block 415 can include, but are not limited to, any combination of processor(s) 205, memory 210, instructions instructing the processor(s) 205 to perform the functionality of block 415 saved in memory 210, wireless communications interface 230, and bus 235 of FIG. 2.
  • the subset of receive chains may be selected at block 410 in accordance with one or more receive chain selection criteria.
  • the one or more receive chain selection criteria may include channel quality associated with the selected at least one CC.
  • the selected at least one CC includes an SCC operating in 4x4 Spatial Diversity Mode, and that a channel quality associated with the SCC is above a channel quality threshold.
  • the SCC can drop some of its receive chains while still providing adequate performance (e.g., sufficient to avoid a measurement gap using residual or non-selected receive chains), such that the SCC may drop two of its receive chains and thereby downgrade to 2x2 Spatial Diversity Mode.
  • the two dropped receive chains may be selected to be part of the selected subset of receive chains at block 410 for performance of the inter-frequency PRS measurement at block 415. After performing the inter-frequency PRS measurement, the two dropped receive chains may be returned to the SCC which, at that point, resumes operation in in 4x4 Spatial Diversity Mode. Moreover, it is possible that multiple CCs are selected at block 410. In this case, it is possible that more than one of the multiple CCs will undergo a "partial" receive chain re-allocated for the inter-frequency PRS measurement (e.g., PCC and SCC1 drop from 4x4 to 2x2, SCCs 1 and 2 drop from 8x8 to 4x4, etc.).
  • PCC and SCC1 drop from 4x4 to 2x2x2
  • FIG. 5 illustrates an example implementation of the process of FIG. 4 in accordance with an embodiment of the disclosure.
  • a given UE has established a PCC and one or more SCCs with respective cells of the RAN 120.
  • the UE performs MIMO communication on the PCC and the one or more SCCs.
  • the given UE determines to perform an inter-frequency PRS measurement.
  • the given UE selects at least one CC (e.g., PCC or SCC) for performing the inter-frequency PRS measurement.
  • CC e.g., PCC or SCC
  • the given UE selects a subset of receive chains of the selected at least one CC for performing the inter-frequency PRS measurement.
  • the given UE tunes each receive chain of the selected subset of receive chains of the selected at least one CC away from the MIMO communication. So, in contrast to block 320 of FIG. 3, some receive chains from the selected at least one CC remain tuned to the MIMO communication during the inter-frequency PRS measurement.
  • the given UE may report a lower rank number (e.g., lower than a rank number reported before the receive chains are tuned away from the MIMO communication), or, for example, an indication of at least one rank number for the selected CC that is lowered, to the RAN 120 (e.g., so a cell associated with the selected at least one CC does not attempt to transmit to the given UE on all receive chains while the selected at least one CC is tuned away from the MIMO communication), based on the tuning away from the MIMO communication of the at least one CC.
  • a lower rank number e.g., lower than a rank number reported before the receive chains are tuned away from the MIMO communication
  • an indication of at least one rank number for the selected CC that is lowered to the RAN 120 (e.g., so a cell associated with the selected at least one CC does not attempt to transmit to the given UE on all receive chains while the selected at least one CC is tuned away from the MIMO communication)
  • the given UE may report the respective lower rank numbers (or indications of the respective lower rank numbers) for each of the multiple CCs.
  • each non- selected CC and each non- selected receive chain among the selected at least one CC continue to perform MIMO communication as in block 500, while at block 530, the selected subset of receive chains of the selected at least one CC performs the inter-frequency PRS measurement.
  • the given UE tunes the selected subset of receive chains of the selected at least one CC back to the MIMO communication, and the process returns to block 500.
  • the tuning of each receive chain of the selected CC away from the MIMO communication causes a measurement gap on the selected CC.
  • the plurality of CCs may be categorized into one of the following CC configurations:
  • Each CC operates in Spatial Diversity Mode
  • One or more CCs operate in Spatial Diversity Mode while one
  • Each CC operates in Spatial Multiplexing Mode and each CC
  • Each CC operates in Spatial Multiplexing Mode and each CC has the same rank number that is greater than 2 ("Spatial
  • Each CC operates in Spatial Multiplexing Mode and two or
  • FIGS. 4-5 relate to various ways in which a CC selected for performing an inter-frequency PRS measurement may tune away less than all of its receive chains
  • FIG. 3 selects the CC to be tuned away for the inter-frequency PRS measurement specifically based upon the relative aggregate throughput contributions by the various CCs
  • embodiments of the disclosure to be described below in more detail select the CC(s) for the inter-frequency PRS measurement based on one or more other factors, including per-rank throughput contribution of each CC (e.g., instead of an aggregated throughput contribution of each CC as in FIG. 3), a transmission mode (e.g., TM1-TM9, Spatial Diversity Mode, Spatial Multiplexing Mode, etc.) of the selected CC(s), a channel quality of the selected CC(s) or a combination thereof.
  • per-rank throughput contribution of each CC e.g., instead of an aggregated throughput contribution of each CC as in FIG. 3
  • a transmission mode e.g., TM1
  • FIG. 6 illustrates a process of performing an inter-frequency PRS measurement in accordance with an embodiment of the disclosure.
  • the process of FIG. 6 may be performed in conjunction with the process of FIG. 4 (e.g., less than all receive chains of a selected CC are tuned away for inter- frequency PRS measurement), or alternatively may be performed separately from the process of FIG. 4.
  • a given UE performs MIMO communication on a plurality of CCs in accordance with a CA scheme with each CC having an associated rank number that indicates a respective number of receive chains for the CC.
  • Means for performing the functionality of block 600 can include, but are not limited to, any combination of processor(s) 205, memory 210, instructions instructing the processor(s) 205 to perform the functionality of block 600 saved in memory 210, wireless communications interface 230, and bus 235 of FIG. 2.
  • the given UE selects at least one of the plurality of CCs for tuning away from the MIMO communication in order to perform an PRS measurement based at least in part upon a per-rank throughput contribution by each of the plurality of CCs, a transmission mode of the selected at least one CC and/or a channel quality of the selected at least one CC.
  • Means for performing the functionality of block 605 can include, but are not limited to, any combination of processor(s) 205, memory 210, instructions instructing the processor(s) 205 to perform the functionality of block 605 saved in memory 210, and bus 235 of FIG. 2.
  • the given UE optionally selects, from among a plurality of receive chains allocated to the selected at least one CC, a subset of receive chains that includes less than all of the plurality of receive chains to be tuned away from the MIMO communication to perform the inter-frequency PRS measurement.
  • Block 610 is optional because, as an alternative, all receive chains for the selected at least one CC may be tuned away to perform the inter- frequency PRS measurement.
  • Means for performing the functionality of block 610 can include, but are not limited to, any combination of processor(s) 205, memory 210, instructions instructing the processor(s) 205 to perform the functionality of block 610 saved in memory 210, and bus 235 of FIG. 2.
  • the given UE tunes a set of receive chains of the selected at least one CC away from the MIMO communication to perform the inter-frequency PRS measurement.
  • the set of receive chains tuned away from the MIMO communication at block 615 corresponds to the selected subset of receive chains from block 610.
  • optional block 610 may include a selection of particular receive chains based on their associated chain- specific channel quality levels as described above with respect to block 410 of FIG. 4.
  • Means for performing the functionality of block 615 can include, but are not limited to, any combination of processor(s) 205, memory 210, instructions instructing the processor(s) 205 to perform the functionality of block 610 saved in memory 210, wireless communications interface 230, and bus 235 of FIG. 2.
  • FIG. 7 illustrates an example implementation of block 605 of FIG. 6 in accordance with an embodiment of the disclosure.
  • CC Configuration #5 e.g., Spatial Multiplexing + Spatial Multiplexing with Unequal Rank
  • the given UE would simply select SCC1 because SCC1, in aggregate, has the lowest throughput contribution relative to PCC and SCC2.
  • the "per-rank" throughput contribution by each of the plurality of CCs is calculated by dividing the aggregate CC throughput contribution of each CC based on each CC's associated rank number, which, in some examples, may be different such that two or more of the plurality of CCs have different rank numbers.
  • the rank number of PCC in 2x2 is 2, such that the 45% throughput contribution is divided by 2 to result in a per-rank throughput contribution of PCC being equal to 22.5%.
  • the per-rank throughput contributions of PCC, SCC1 and SCC2 are as follows:
  • the given UE selects one or more CCs with the lowest per-rank throughput contribution as the selected at least one CC to be tuned away (at least in part) for the inter-frequency PRS measurement, instead of the CC with the lowest aggregate throughput contribution as in FIG. 3. Accordingly, under the assumptions above, further assume that SSC2 is selected as the selected at least one CC to be tuned away for the inter-frequency PRS measurement.
  • a subset of receive chains e.g., 2 receive chains
  • the given UE may select both SCC1 and SCC2 based on these CCs having the two lowest per-rank throughput contributions among the CCs to be tuned away (at least in part) for the inter-frequency PRS measurement, instead of only selecting a single CC. Accordingly, under the assumptions above, further assume that both SCC1 and SSC2 are selected as the selected at least one CC to be tuned away for the inter-frequency PRS measurement.
  • the per-rank throughput contribution may be calculated at block 700 by dividing the aggregated throughput contributions of the CCs using some other number rather than the rank number itself (e.g., if the rank numbers of all CCs are multiples of 2, than aggregated throughput contributions may be divided by half of each CCs respective rank number, which would result in PCC having a per-rank throughput contribution of 45%, SCCl having a per-rank throughput contribution 12.5% and SCC2 having a "per-rank" throughput contribution of 7.5%).
  • the manner in which the aggregated throughput contributions are scaled to achieve the per-rank throughput contribution is somewhat arbitrary in the sense that the ranking of the per- rank throughput contributions among the CCs is unchanged.
  • FIG. 8 illustrates an example implementation of block 605 of FIG. 6 in accordance with another embodiment of the disclosure.
  • CC Configuration #2 e.g., Spatial Diversity + Spatial Multiplexing
  • the given UE would simply select SCCl or SCC2 (i.e., arbitrarily) because SCCl and SCC2, in aggregate, are tied for the lowest throughput contribution.
  • the given UE determines a transmission mode of each CC, as shown in Table 9.
  • the transmission mode may be determined as being one of TM1-TM9, each of which corresponds to either a Spatial Multiplexing Mode or a Spatial Diversity Mode.
  • the given UE determines a channel quality of each CC using Spatial Diversity Mode.
  • SCC1 and SCC2 are using Spatial Diversity Mode.
  • the channel quality may be determined in a variety of ways (e.g., transport block size, signal-to-noise ratio (SNR), etc.).
  • each receive chain may have a different channel quality due to various factors (e.g., how the user is holding the UE, UE orientation, AOA of signals from a base station, etc.).
  • the channel quality for a particular CC e.g., SCC1, SCC2, etc.
  • the channel quality for a particular CC may be an average of the receive chain-specific channel qualities measured on each of that particular CC's respective receive chains.
  • the given UE determines whether the channel quality of any CC using Spatial Diversity Mode is above a first channel quality threshold.
  • the first channel quality threshold may be set high enough so that a first threshold number of receive chains (e.g., 2 receive chains) may be taken away from the CC without causing the channel quality on the CC to drop below a lower channel quality threshold.
  • a CC using Spatial Diversity Mode above the first channel quality threshold is expected to be able to provide all the receive chains necessary to perform the inter-frequency PRS measurement without compromising performance on the CC.
  • the first channel quality threshold may be configured such that one or more non-selected receive chains from the selected single CC that remain tuned to the MIMO communication during a PRS measurement are expected to be sufficient to monitor the MIMO communication during the PRS measurement without a measurement gap. If such a CC is detected at block 810, a single CC using Spatial Diversity Mode is selected at block 815. Receive chain(s) from the selected single CC are then used to perform the inter-frequency PRS measurement, after which the freed receive chain(s) are returned to the selected single CC.
  • the given UE may select the CC with the highest channel quality and/or the lowest aggregate or per-rank throughput contribution, or the given UE may select each CC above the first channel quality threshold (e.g., with receive chains being taken from each selected CC), and so on.
  • the given UE may select the CC with both a low throughput contribution and a poor channel quality, as selecting such CCs for performing the inter- frequency PRS measurement may cause channel deterioration below a nominal threshold and effectively reduce their throughput contribution to 0.
  • the given UE determines whether there is a combination of CCs using Spatial Diversity Mode having a channel quality above a second channel quality threshold.
  • the second channel quality threshold is set lower than the first second channel quality threshold and is set so that a second threshold number of receive chains (e.g., 1 receive chain) may be taken away from the CC without causing the channel quality on the CC to drop below the lower channel quality threshold.
  • a CC using Spatial Diversity Mode above the second channel quality threshold is expected to be able to provide at least one receive chain, which, in combination with receive chains from other CCs, may collectively be sufficient to perform the inter-frequency PRS measurement without compromising performance (e.g., causing a measurement gap) on any of the contributing CCs.
  • the second channel quality threshold may be configured such that one or more non- selected receive chains from each of the multiple selected CCs that remain tuned to the MIMO communication during a PRS measurement are expected to be sufficient to monitor the MIMO communication during the PRS measurement without a measurement gap.
  • CCs using Spatial Diversity Mode are selected to have at least one receive chain tuned away to perform the inter-frequency PRS measurement at block 825.
  • one or more CC(s) may be selected using some other mechanism. For example, at least one receive chain may be selected from one or more CCs using Spatial Diversity Mode and at least one receive chain may be selected from one or more CCs using Spatial Multiplexing Mode.
  • At least one CC configured for operation in accordance with the Spatial Multiplexing Mode is included among multiple CCs for tuning away to perform a PRS measurement in response to the CC(s) configured for operation in accordance with the Spatial Diversity Mode having a channel quality below a channel quality threshold (e.g., the first and/or second channel quality thresholds, as noted above).
  • a channel quality threshold e.g., the first and/or second channel quality thresholds, as noted above.
  • aggregate CC throughput and/or per-rank throughput may be used as described above.
  • a general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in a user terminal (e.g., UE).
  • the processor and the storage medium may reside as discrete components in a user terminal.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium that contains instructions to perform the functions.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media may be any available media that can be accessed by a computer.
  • such computer- readable media can comprise non-transitory storage media such as RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium.
  • Disk and disc includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

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Abstract

Selon des modes de réalisation, l'invention concerne un équipement utilisateur (UE) configuré pour la réalisation d'une communication entrée multiple sortie multiple (MIMO) sur une pluralité de porteuses composantes (CC) selon un schéma d'agrégation de porteuses (CA), chaque porteuse composante ayant un numéro de rang associé qui indique un nombre respectif de chaînes de réception pour la porteuse composante, la sélection d'au moins une parmi la pluralité de porteuses composantes pour une syntonisation à distance de la communication MIMO afin d'effectuer une mesure d'un signal de référence de positionnement (PRS) inter-fréquences sur la base, au moins en partie, d'une contribution de débit par rang par chacune de la pluralité de porteuses composantes, d'un mode de transmission de ladite au moins une porteuse composante sélectionnée et/ou d'une qualité de canal de ladite une porteuse composante sélectionnée, et la syntonisation d'un ensemble de chaînes de réception de ladite une porteuse composante sélectionnée à distance de la communication MIMO pour effectuer la mesure de signal de référence de positionnement inter-fréquences.
PCT/US2018/051883 2017-09-22 2018-09-20 Sélection d'une porteuse composante pour la syntonisation à distance de communication entrée multiple sortie multiple (mimo) pour effectuer une mesure de signal de référence de positionnement inter-fréquences WO2019060505A1 (fr)

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US10804983B2 (en) 2017-09-22 2020-10-13 Qualcomm Incorporated Tuning a subset of receive chains of a component carrier away from MIMO communication to perform an inter-frequency positioning reference signal measurement
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